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Measurement of the D → K− π+ π+ π− and D → K− π+ π0 coherence factors and average strong-phase differences in quantum-correlated DD¯ decays
- Source :
- Journal of High Energy Physics, Journal of high energy physics 2021(5), 164 (2021). doi:10.1007/JHEP05(2021)164, Journal of High Energy Physics, 2021(5):164. SPRINGER, Journal of High Energy Physics, Vol 2021, Iss 5, Pp 1-46 (2021)
- Publication Year :
- 2021
- Publisher :
- SPRINGER, 2021.
-
Abstract
- The decays D → K−π+π+π− and D → K−π+π0 are studied in a sample of quantum-correlated $$ D\overline{D} $$ D D ¯ pairs produced through the process e+e− → ψ(3770) → $$ D\overline{D} $$ D D ¯ , exploiting a data set collected by the BESIII experiment that corresponds to an integrated luminosity of 2.93 fb−1. Here D indicates a quantum superposition of a D0 and a $$ {\overline{D}}^0 $$ D ¯ 0 meson. By reconstructing one neutral charm meson in a signal decay, and the other in the same or a different final state, observables are measured that contain information on the coherence factors and average strong-phase differences of each of the signal modes. These parameters are critical inputs in the measurement of the angle γ of the Unitarity Triangle in B− → DK− decays at the LHCb and Belle II experiments. The coherence factors are determined to be RK3π = $$ {0.52}_{-0.10}^{+0.12} $$ 0.52 − 0.10 + 0.12 and $$ {R}_{K{\pi \pi}^0} $$ R K ππ 0 = 0.78 ± 0.04, with values for the average strong-phase differences that are $$ {\delta}_D^{K3\pi }=\left({167}_{-19}^{+31}\right){}^{\circ} $$ δ D K 3 π = 167 − 19 + 31 ° and $$ {\delta}_D^{K{\pi \pi}^0}=\left({196}_{-15}^{+14}\right){}^{\circ} $$ δ D K ππ 0 = 196 − 15 + 14 ° , where the uncertainties include both statistical and systematic contributions. The analysis is re-performed in four bins of the phase-space of the D → K−π+π+π− to yield results that will allow for a more sensitive measurement of γ with this mode, to which the BESIII inputs will contribute an uncertainty of around 6°.
- Subjects :
- Nuclear and High Energy Physics
Particle physics
Meson
D0 --> K- pi+ pi0
Phase (waves)
e+-e− Experiments
BELLE
QC770-798
annihilation [electron positron]
CKM angle gamma
01 natural sciences
Luminosity
NO
D0 --> K- 2pi+ pi
Subatomär fysik
phase space
Nuclear and particle physics. Atomic energy. Radioactivity
0103 physical sciences
Subatomic Physics
ddc:530
010306 general physics
Quantum
hadronic decay [D0]
electroproduction [psi(3770)]
Charm physics
Physics
e+-e- Experiments
BES
Unitarity
010308 nuclear & particles physics
pair production [D0]
e +-e − Experiments
Observable
Beijing Stor
State (functional analysis)
Charm physics, e+-e− Experiments, CKM angle gamma
LHC-B
coherence
psi(3770) --> D0 anti-D0
e-e Experiments
colliding beams [electron positron]
charm
statistical
unitarity [CKM matrix]
experimental results
Coherence (physics)
Subjects
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2021
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Journal of High Energy Physics
- Accession number :
- edsair.doi.dedup.....c6f0e763097f3a0312e9afb356be5762